After a five-year voyage, the Galileo spacecraft arrives at Jupiter. Still in orbit in 2002, it has made more than 30 orbits of Jupiter, usually flying close to one of its four major moons.

Through its observations, Galileo scientists discover strong evidence that Jupiter's moon Europa has a melted saltwater ocean under an ice layer on its surface. The spacecraft also finds indications that two other moons, Ganymede and Callisto, have layers of liquid saltwater as well.

See also: Galileo home page

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